Method and device in first node for wireless communication

ABSTRACT

The present disclosure provides a method and a device in a first node for wireless communication. The first node first performs a monitoring on first-type signalings, in which K1 first-type signalings are detected; and then transmits a first radio signal in a first time-frequency resource set; each of the K1 first-type signalings is associated to the first time-frequency resource set; a first signaling is a last first-type signaling of the K1 first-type signaling; the first radio signal is used for determining the receiving of first-type signaling(s) associated to the first time-frequency resource set before the first signaling; or is used for determining the decoding of bit blocks scheduled by the K1 first-type signalings. With the above-mentioned designs, the present disclosure manages to address missed detection of sidelink scheduling signaling caused when a data receiver sends NACK-only feedback in V2X, thereby further improving the entire system performance.

CROSS-REFERENCE TO RELATED APPLICATION

This application the continuation of the U.S. patent Ser. No.16/721,947, filed on Dec. 20, 2019, which claims the priority benefit ofChinese Patent Application Serial Number 201811561074.7, filed on Dec.20, 2018, the full disclosure of which is incorporated herein byreference.

BACKGROUND Technical Field

The present disclosure relates to transmission methods and devices inwireless communication systems, and in particular to a method and adevice of communication on Sidelink in wireless communications.

Related Art

Application scenarios of future wireless communication systems arebecoming increasingly diversified, and different application scenarioshave different performance demands on systems. In order to meetdifferent performance requirements of various application scenarios, the3rd Generation Partner Project (3GPP) Radio Access Network (RAN) #72plenary session decided to conduct the study of New Radio (NR), or whatis called fifth Generation (5G). The work Item (WI) of NR was approvedat the 3GPP RAN #75 plenary session to standardize the NR.

In response to rapidly growing Vehicle-to-Everything (V2X) business,3GPP has started standards setting and research work under the frameworkof NR. Currently, 3GPP has completed planning work targeting 5G V2Xrequirements and has included these requirements into standard TS22.886,where 3GPP identifies and defines 4 major Use Case Groups, coveringcases of Vehicles Platooning, supporting Extended Sensors, AdvancedDriving and Remote Driving. At 3GPP RAN #80 Plenary Session, thetechnical Study Item (SI) of NR V2X was initialized.

SUMMARY

To fulfill new service requirements, compared with conventional LTE V2Xsystem, NR V2X system will be provided with higher throughput andreliability, lower latency, longer communication distance and moreprecise positioning, more various packet size and transmission periods,as well as other key techniques that can support coexistence of 3GPP andnon-3GPP more efficiently. Currently, the LTE-V2X system is limited tobroadcast communication, while the study of NR V2X will focus ontechnical solutions supporting unicast, groupcast and broadcastsimultaneously, as commonly agreed at the 3GPP RAN #80 Plenary Session.

In the existing LTE Device to Device (D2D)/V2X, a Physical SidelinkFeedback Channel (PSFCH) is introduced into Release 16 V2X, which is atleast used for Hybrid Automatic Repeat request (HARQ) feedback onSidelink. As for groupcast transmission, it is generally acknowledgedthat sending Non-Acknowledgement (NACK) only when a Physical SidelinkShared Channel (PSSCH) is not correctly received will be beneficial tolowering the feedback signaling overhead. However, sending NACK-only mayconfuse a data transmitter when not receiving NACK because thetransmitter cannot determine whether a data receiver does not transmitNACK because the data has been correctly received or because thereceiver does not know the data exists without receiving schedulinginformation.

To address the above problem, the present disclosure provides a solutionto support unicast and groupcast communications. It should be noted thatembodiments of a User Equipment (UE) in the present disclosure andcharacteristics of the embodiments may be applied to a base station, andvice versa, if no conflict is incurred. The embodiments in the presentdisclosure and the characteristics of the embodiments may be arbitrarilycombined if there is no conflict. Though originally targeted atunicast-based mechanism, the present disclosure is also applicable tobroadcast and groupcast communications. Further, the present disclosureis designed for single-carrier communication but is also used inmulticarrier communication.

The present disclosure provides a method in a first node for wirelesscommunication, comprising:

performing a monitoring on first-type signalings, in which K1 first-typesignalings are detected; and

transmitting a first radio signal in a first time-frequency resourceset;

herein, each of the K1 first-type signalings is associated to the firsttime-frequency resource set; a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded in a time domain position before the firstsignaling; the K1 is a positive integer.

The present disclosure provides a method in a first node for wirelesscommunication, comprising:

performing a monitoring on first-type signalings, in which K1 first-typesignalings are detected; and

transmitting a first radio signal in a first time-frequency resourceset;

herein, each of the K1 first-type signalings is associated to the firsttime-frequency resource set; a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is not any first-typesignaling associated to the first time-frequency resource set not havingbeen correctly decoded in a time domain position before the firstsignaling, and at least one of the K1 first-type signalings schedules abit block that is not decoded correctly; the K1 is a positive integer.

In one embodiment, an advantage of the above method is that a firsttime-frequency resource set is associated to a plurality of first-typesignalings, so that the receiver of V2X information is able to reportthe receiving situation of all physical layer signalings associated tothe first time-frequency resource set and of data channels scheduled bythe signalings to the transmitter of V2X information via the first radiosignal, thereby guaranteeing the transmission performance on V2X link.

In one embodiment, another advantage of the above method is that sincethe V2X link only reflects NACK scenarios, the first signaling is a lastfirst-type signaling of all first-type signalings associated to thefirst time-frequency resource set detected by the first node,furthermore, the first radio signal also notifies the second node in thepresent disclosure whether the first node has missed detection on anyfirst-type signaling before the first signaling, thus solving theproblem of not reflecting NACK resulted from missed detection byscheduling in NACK-Only feedback.

According to one aspect of the present disclosure, the above method ischaracterized in comprising:

receiving first information;

herein, the first information is used for indicating a second timedomain resource set, the K1 first-type signalings respectively occupy K1second time domain resource subsets in time domain, the second timedomain resource set comprises the K1 second time domain resource subsets.

According to one aspect of the present disclosure, the above method ischaracterized in that the phrase that each of the K1 first-typesignalings is associated to the first time-frequency resource set meansthat the K1 is greater than 1, each of the K1 first-type signalingsindicates the first time-frequency resource set.

In one embodiment, an advantage of the above method is that indicatingthe first time-frequency resource set via first-type signalings enablesmore flexible configuration of the first time-frequency resource set.

According to one aspect of the present disclosure, the above method ischaracterized in that the phrase that each of the K1 first-typesignalings is associated to the first time-frequency resource set meansthat time domain resources occupied by each of the K1 first-typesignalings belong to a second time domain resource set, the second timedomain resource set is associated to the first time-frequency resourceset.

In one embodiment, an advantage of the above method is that connectingthe second time domain resource set to the first time-frequency resourceset helps reduce the signaling overhead.

According to one aspect of the present disclosure, the above method ischaracterized in that a first bit is used for generating the first radiosignal; the first bit is used for determining that there is(are)first-type signaling(s) associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling.

According to one aspect of the present disclosure, the above method ischaracterized in that a first bit is used for generating the first radiosignal; the first bit is used for determining that there is not anyfirst-type signaling associated to the first time-frequency resource setnot having been correctly decoded in a time domain position before thefirst signaling, and at least one of the K1 first-type signalingsschedules a bit block that is not decoded correctly.

In one embodiment, an advantage of the above method is that thereceiving of first-type signalings associated to the firsttime-frequency resource set and of bit blocks scheduled by thefirst-type signalings can be reflected through the first bit alone,thereby reducing the signaling overhead.

According to one aspect of the present disclosure, the above method ischaracterized in that a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource set, the K1first-type signalings are transmitted by a transmitter of the K1first-type signalings respectively in K1 out of the K2 second timedomain resource subsets; the K2 bits are used for determining that K3first-type signaling(s) is(are) not correctly decoded, the K3 first-typesignaling(s) is(are) transmitted by the transmitter of the K1 first-typesignalings respectively in K3 second time domain resource subset(s) outof the K2 second time domain resource subsets other than the K1 secondtime domain resource subsets, the K3 is a difference between the K2 andthe K1.

According to one aspect of the present disclosure, the above method ischaracterized in that a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource set, the K1first-type signalings are transmitted by a transmitter of the K1first-type signalings respectively in K1 out of K2 second time domainresource subsets; the K2 bits are used for determining that K4 bitblock(s) is(are) not correctly decoded, the K4 bit blocks is(are)respectively used for generating K4 radio signal(s), the K4 radiosignal(s) is(are) respectively scheduled by K4 first-type signaling(s)of the K1 first-type signalings, the K4 is a positive integer notgreater than the K1.

In one embodiment, an advantage of the above method is that the secondbit sequence is used to indicate to the second node first-typesignaling(s) undetected by the first node and bit blocks not having beencorrectly received by data scheduled by first-type signalings detectedby the first node; thus increasing the precision of the feedback andimproving the transmission performance on the V2X link.

According to one aspect of the present disclosure, the above method ischaracterized in comprising:

receiving K1 radio signals;

herein, the K1 first-type signalings are respectively used forscheduling the K1 radio signals, K1 bit blocks are used for generatingthe K1 radio signals.

According to one aspect of the present disclosure, the above method ischaracterized in that each of the M1 first-type signalings is associatedto the first time-frequency resource set, any of the K1 first-typesignalings is one of the M1 first-type signalings; a given first-typesignaling is any of the M1 first-type signalings, the given first-typesignaling comprises a first field, the first field is used fordetermining a sequence number of the given first-type signaling in theM1 first-type signalings; the M1 is a positive integer not less than theK1.

In one embodiment, an advantage of the above method is that byintroducing a first field, the first node will be aware of the positionof a first-type signaling in the M1 first-type signalings whenever thefirst-type signaling is detected, therefore, the first node is able todetermine whether there is any other first-type signaling missed outbefore the detected first-type signaling in time domain.

The present disclosure provides a method in a second node for wirelesscommunication, comprising:

transmitting M1 first-type signalings; and

monitoring a first radio signal in a first time-frequency resource set;

herein, each of the M1 first-type signalings is associated to the firsttime-frequency resource set; a transmitter of the first radio signal isa first node; the first node performs a monitoring on first-typesignalings, in which K1 of the M1 first-type signalings are detected, afirst signaling is a last first-type signaling of the K1 first-typesignalings in time domain; the first radio signal is used fordetermining that there is(are) first-type signaling(s) associated to thefirst time-frequency resource set not having been correctly decoded bythe first node in a time domain position before the first signaling; theK1 is a positive integer, and the M1 is a positive integer not less thanthe K1.

The present disclosure provides a method in a second node for wirelesscommunication, comprising:

transmitting M1 first-type signalings; and

monitoring a first radio signal in a first time-frequency resource set;

herein, each of the M1 first-type signalings is associated to the firsttime-frequency resource set; a transmitter of the first radio signal isa first node; the first node performs a monitoring on first-typesignalings, in which K1 of the M1 first-type signalings are detected, afirst signaling is a last first-type signaling of the K1 first-typesignalings in time domain; the first radio signal is used fordetermining that there is not any first-type signaling associated to thefirst time-frequency resource set not having been correctly decoded bythe first node in a time domain position before the first signaling, andat least one of the K1 first-type signalings schedules a bit block thatis not decoded correctly by the first node; the K1 is a positiveinteger, and the M1 is a positive integer not less than the K1.

According to one aspect of the present disclosure, the above method ischaracterized in comprising:

transmitting first information;

herein, the first information is used for indicating a second timedomain resource set, the M1 first-type signalings respectively occupy M1second time domain resource subsets in time domain, the second timedomain resource set comprises the M1 second time domain resource subsets.

According to one aspect of the present disclosure, the above method ischaracterized in that the phrase that each of the M1 first-typesignalings is associated to the first time-frequency resource set meansthat time domain resources occupied by each of the M1 first-typesignalings belong to a second time domain resource set, the second timedomain resource set is associated to the first time-frequency resourceset.

According to one aspect of the present disclosure, the above method ischaracterized in that a first bit is used for generating the first radiosignal, the first bit is used for determining that there is(are)first-type signaling(s) associated to the first time-frequency resourceset not having been correctly decoded by the first node in a time domainposition before the first signaling.

According to one aspect of the present disclosure, the above method ischaracterized in that a first bit is used for generating the first radiosignal, the first bit is used for determining that there is not anyfirst-type signaling associated to the first time-frequency resource setnot having been correctly decoded by the first node in a time domainposition before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly by the first node.

According to one aspect of the present disclosure, the above method ischaracterized in that a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer no less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource set, the K1first-type signalings are transmitted by a transmitter of the K1first-type signalings respectively in K1 out of K2 second time domainresource subsets; the K2 bits are used for determining that K3first-type signaling(s) is(are) not correctly decoded, the K3 first-typesignaling(s) is(are) transmitted by the transmitter of the K1 first-typesignalings respectively in K3 second time domain resource subset(s) outof the K2 second time domain resource subsets other than the K1 secondtime domain resource subsets, the K3 is a difference between the K2 andthe K1.

According to one aspect of the present disclosure, the above method ischaracterized in that a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer no less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource set, the K1first-type signalings are transmitted by a transmitter of the K1first-type signalings respectively in K1 out of K2 second time domainresource subsets; the K2 bits are used for determining that K4 bitblock(s) is(are) not correctly decoded, the K4 bit blocks is(are)respectively used for generating K4 radio signal(s), the K4 radiosignal(s) is(are) respectively scheduled by K4 first-type signaling(s)of the K1 first-type signalings, the K4 is a positive integer notgreater than the K1.

According to one aspect of the present disclosure, the above method ischaracterized in comprising:

transmitting M1 radio signals;

herein, the M1 first-type signalings are respectively used forscheduling the M1 radio signals, M1 bit blocks are used for generatingthe M1 radio signals.

According to one aspect of the present disclosure, the above method ischaracterized in that any of the K1 first-type signalings is one of theM1 first-type signalings; a given first-type signaling is any of the M1first-type signalings, the given first-type signaling comprises a firstfield, the first field is used for determining a sequence number of thegiven first-type signaling in the M1 first-type signaling.

The present disclosure provides a first node for wireless communication,comprising:

a first receiver, performing a monitoring on first-type signalings, inwhich K1 first-type signalings are detected; and

a first transmitter, transmitting a first radio signal in a firsttime-frequency resource set;

herein, each of the K1 first-type signalings is associated to the firsttime-frequency resource set; a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded in a time domain position before the firstsignaling; the K1 is a positive integer.

The present disclosure provides a first node for wireless communication,comprising:

a first receiver, performing a monitoring on first-type signalings, inwhich K1 first-type signalings are detected; and

a first transmitter, transmitting a first radio signal in a firsttime-frequency resource set;

herein, each of the K1 first-type signalings is associated to the firsttime-frequency resource set; a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is not any first-typesignaling associated to the first time-frequency resource set not havingbeen correctly decoded in a time domain position before the firstsignaling, and at least one of the K1 first-type signalings schedules abit block that is not decoded correctly; the K1 is a positive integer.

The present disclosure provides a second node for wirelesscommunication, comprising:

a second transmitter, transmitting M1 first-type signalings; and

a second receiver, monitoring a first radio signal in a firsttime-frequency resource set;

herein, each of the M1 first-type signalings is associated to the firsttime-frequency resource set; a transmitter of the first radio signal isa first node; the first node performs a monitoring on first-typesignalings, in which K1 of the M1 first-type signalings are detected, afirst signaling is a last first-type signaling of the K1 first-typesignalings in time domain; the first radio signal is used fordetermining that there is(are) first-type signaling(s) associated to thefirst time-frequency resource set not having been correctly decoded bythe first node in a time domain position before the first signaling; theK1 is a positive integer, and the M1 is a positive integer not less thanthe K1.

The present disclosure provides a second node for wirelesscommunication, comprising:

a second transmitter, transmitting M1 first-type signalings; and

a second receiver, monitoring a first radio signal in a firsttime-frequency resource set;

herein, each of the M1 first-type signalings is associated to the firsttime-frequency resource set; a transmitter of the first radio signal isa first node; the first node performs a monitoring on first-typesignalings, in which K1 of the M1 first-type signalings are detected, afirst signaling is a last first-type signaling of the K1 first-typesignalings in time domain; the first radio signal is used fordetermining that there is not any first-type signaling associated to thefirst time-frequency resource set not having been correctly decoded bythe first node in a time domain position before the first signaling, andat least one of the K1 first-type signalings schedules a bit block thatis not decoded correctly by the first node; the K1 is a positiveinteger, and the M1 is a positive integer not less than the K1.

In one embodiment, the present disclosure is advantageous overconventional schemes in the following aspects:

By connecting the first time-frequency resource set with a plurality offirst-type signalings, the receiver of V2X information reports thereceiving situation of all physical layers associated to the firsttime-frequency resource set and of scheduled data channels to thetransmitter of the V2X information via the first radio signal so as toensure the transmission performance on the V2X link.

Given that the V2X link only reflects the NACK scenarios, the firstsignaling is a last first-type signaling of all first-type signalingsassociated to the first time-frequency resource set detected by thefirst node, and the first radio signal also notifies the second node ofthe present disclosure whether the first node has missed detection onany first-type signaling before the first signaling, so as to solve theproblem of not sending NACK due to missed detection of scheduling thatoccurs in NACK-only feedback.

By designing bits or bit sequence(s) in the first radio signal, it ispracticable to reflect undetected first-type signaling(s) and bit blocksincorrectly detected by data channel(s) in correctly detected first-typesignaling(s), thereby improving the feedback quality and enhancing theV2X link performance.

By introducing a first field, the first node will be aware of theposition of a first-type signaling in the M1 first-type signalingswhenever a first-type signaling is detected, and will thus be able todetermine whether there is missed detection of any other first-typesignaling in time domain before the detected first-type signaling.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, objects and advantages of the present disclosure willbecome more apparent from the detailed description of non-restrictiveembodiments taken in conjunction with the following drawings:

FIG. 1 illustrates a flowchart of performing a monitoring on first-typesignalings according to one embodiment of the present disclosure;

FIG. 2 illustrates a schematic diagram of a network architectureaccording to one embodiment of the present disclosure;

FIG. 3 illustrates a schematic diagram of an example of a radio protocolarchitecture of a user plane and a control plane according to oneembodiment of the present disclosure;

FIG. 4 illustrates a schematic diagram of a first node and a second nodeaccording to one embodiment of the present disclosure;

FIG. 5 illustrates a flowchart of a first radio signal according to oneembodiment of the present disclosure;

FIG. 6 illustrates a schematic diagram of a first time-frequencyresource set according to one embodiment of the present disclosure;

FIG. 7 illustrates a schematic diagram of a second time domain resourceset according to one embodiment of the present disclosure;

FIG. 8 illustrates a schematic diagram of a second time domain resourceset according to another embodiment of the present disclosure;

FIG. 9 illustrates a schematic diagram of M1 first-type signalingsaccording to one embodiment of the present disclosure;

FIG. 10 illustrates a schematic diagram of a first radio signalaccording to one embodiment of the present disclosure;

FIG. 11 illustrates a schematic diagram of a first radio signalaccording to another embodiment of the present disclosure;

FIG. 12 illustrates a schematic diagram of a first node and a secondnode according to one embodiment of the present disclosure;

FIG. 13 illustrates a structure block diagram of a processing device ina first node according to one embodiment of the present disclosure;

FIG. 14 illustrates a structure block diagram of a processing device ina second node according to one embodiment of the present disclosure.

DESCRIPTION OF THE EMBODIMENTS

The technical scheme of the present disclosure is described below infurther details in conjunction with the drawings. It should be notedthat the embodiments of the present disclosure and the characteristicsof the embodiments may be arbitrarily combined if no conflict is caused.

Embodiment 1

Embodiment 1 illustrates a flowchart of performing a monitoring onfirst-type signaling, as shown in FIG. 1 .

In Embodiment 1, the first node in the present disclosure first performsa monitoring on first-type signalings, in which K1 first-type signalingsare detected; and then transmits a first radio signal in a firsttime-frequency resource set; each of the K1 first-type signalings isassociated to the first time-frequency resource set; a first signalingis a last first-type signaling of the K1 first-type signalings in timedomain; the first radio signal is used for determining that thereis(are) first-type signaling(s) associated to the first time-frequencyresource set not having been correctly decoded in a time domain positionbefore the first signaling; or, the first radio signal is used fordetermining that there is not any first-type signaling associated to thefirst time-frequency resource set not having been correctly decoded in atime domain position before the first signaling, and at least one of theK1 first-type signalings schedules a bit block that is not decodedcorrectly; the K1 is a positive integer.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that the K1 first-type signalings respectively comprise K1 CyclicRedundancy Check (CRC) sequences, the first node determines that the K1first-type signalings are correctly decoded respectively based ondectections on the K1 CRC sequences.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that a target first-type signaling is any of the K1 first-typesignalings, the target first-type signaling comprises a CRC sequencescrambled by a given RNTI, the first node performs CRC sequence checkusing the given RNTI and the CRC sequence check is completedsuccessfully, the first node assumes that the target first-typesignaling is correctly decoded.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that a target first-type signaling is any of the K1 first-typesignalings, the target first-type signaling comprises a CRC sequence;the first node, after receiving the target first-type signaling, employsthe CRC sequence comprised by the received target first-type signalingin the Modulo (Mod) 2 Division of the Cyclic Generation Polynomial ofthe CRC sequence, which yields a remainder of 0, then the first nodeassumes that the target first-type signaling is correctly decoded.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that the K1 first-type signalings are respectively composed of K1characteristic sequences, the first node determines that the K1first-type signalings are correctly received respectively based oncoherent detections.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that a target first-type signaling is any of the K1 first-typesignalings, the target first-type signaling is generated by a firsttarget sequence, the first target sequence is one of L1 first-typecandidate sequences; the L1 is a positive integer greater than 1;through coherent detections, the first node determines the first targetsequence out of the L1 first-type candidate sequences according to themonitored target first-type signaling, and then assumes that the targetfirst-type signaling is correctly received.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that a target first-type signaling is any of the K1 first-typesignalings, the target first-type signaling is generated by one of L1first-type candidate sequences; the L1 is a positive integer greaterthan 1; through coherent detections, the first node can determine afirst-type candidate sequence out of the L1 first-type candidatesequences according to the monitored target first-type signaling, andthen assumes that the target first-type signaling is correctly received.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that the first node determines that the K1 first-type signalingsare correctly received based on energy detection.

In one embodiment, the phrase that K1 first-type signalings are detectedmeans that a power value of any of the K1 first-type signalingsmonitored by the first node is not less than a first threshold, thefirst node assumes that the K1 first-type signalings are correctlyreceived.

In one embodiment, the phrase that there is(are) first-type signaling(s)associated to the first time-frequency resource set not having beencorrectly decoded in a time domain position before the first signalingmeans that the first time-frequency resource set is associated to M1first-type signalings, among the M1 first-type signalings there are K2first-type signalings located in a time domain position before the firstsignaling; the K2 first-type signalings include the K1 first-typesignalings detected by the first node, and the K2 first-type signalingsat least include one first-type signaling not having been correctlydecoded by the first node other than the K1 first-type signalings.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first-type signaling comprises a CRC sequence, the firstnode determines that the first-type signaling is not correctly decodedbased on a detection on the CRC sequence.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first-type signaling comprises a CRC sequence scrambledby a given RNTI, the first node performs CRC sequence check using thegiven RNTI and the CRC sequence check is failed, the first node assumesthat the target first-type signaling is correctly decoded.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first-type signaling comprises a CRC sequence; the firstnode, after receiving the first-type signaling, employs the CRC sequencecomprised by the received first-type signaling in the Modulo (Mod) 2Division of the Cyclic Generation Polynomial of the CRC sequence, whichyields a remainder unequal to 0, then the first node assumes that thetarget first-type signaling is not correctly decoded.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first-type signaling is generated by a givencharacteristic sequence, the first node determines that the first-typesignaling is correctly received based on coherent detection.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first-type signaling is generated by a target sequence,the target sequence is one of L1 first-type candidate sequences; the L1is a positive integer greater than 1; through coherent detections, thefirst node cannot determine the target sequence out of the L1 first-typecandidate sequences according to the monitored first-type signaling,then the first node assumes that the first-type signaling is notcorrectly received.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first-type signaling is generated by one of L1 first-typecandidate sequences; the L1 is a positive integer greater than 1;through coherent detections, the first node cannot determine anyfirst-type candidate sequence out of the L1 first-type candidatesequences according to the monitored first-type signaling, the firstnode then assumes that the first-type signaling is not correctlyreceived.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that the first node determines that the first-type signaling isnot correctly received based on energy detection.

In one subembodiment of the above embodiment, the phrase that onefirst-type signaling not having been correctly decoded by the first nodemeans that a power value of the first-type signaling monitored by thefirst node is less than a first threshold, the first node assumes thatthe first-type signaling is not correctly received.

In one embodiment, any of the K1 first-type signalings is a physicallayer signaling.

In one embodiment, the K1 first-type signalings are Time DivisionMultiplexed (TDM).

In one embodiment, the K1 first-type signalings respectively occupy K1second time domain resource subsets in time domain, any two of the K2second time domain resource subsets are orthogonal in time domain.

In one embodiment, the K1 first-type signalings respectively occupy K1second time domain resource subsets in time domain, a second time domainresource set comprises the K1 second time domain resource subsets, allfirst-type signalings detected in the second time domain resource setare transmitted by a same transmitter.

In one embodiment, the K1 is equal to 1.

In one embodiment, a physical layer channel occupied by any of the K1first-type signalings includes a Physical Sidelink Control Channel(PSCCH).

In one embodiment, a signaling format corresponding to any of the K1first-type signalings is a Sidelink Control Information (SCI) format 1.

In one embodiment, a signaling format corresponding to any of the K1first-type signalings is an SCI format 0.

In one embodiment, any of the K1 first-type signalings comprises allfields of an SCI format 0, or any of the K1 first-type signalingscomprises part of fields of an SCI format 0.

In one embodiment, any of the K1 first-type signalings comprises allfields of an SCI format 1, or any of the K1 first-type signalingscomprises part of fields of an SCI format 1.

In one embodiment, the K1 first-type signalings respectively comprise K1CRC sequences, each of the K1 CRC sequences is scrambled by a givenRNTI, the given RNTI is specific to a terminal group, the terminal groupcomprises a positive integer number of terminal(s), and the first nodeis one of the positive integer number of terminal(s).

In one subembodiment, the K1 first-type signalings are all transmittedby a second node, the second node is a terminal of the terminal groupother than the first node.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node realizes the monitoring on thefirst-type signalings through decoding of the first-type signalings.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node realizes the monitoring on thefirst-type signalings through sensing of the first-type signalings.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node realizes the monitoring on thefirst-type signalings through decoding and CRC check of the first-typesignalings.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node realizes the monitoring on thefirst-type signalings through energy detection and decoding of thefirst-type signalings.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node realizes the monitoring on thefirst-type signalings through decoding of SCI.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node realizes the monitoring on thefirst-type signalings through sensing of SCI.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node performs decoding of SCItransmitted by other node(s).

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that the first node performs sensing of SCItransmitted by other node(s).

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that a second time domain resource set is associatedto the first time-frequency resource set, the second time domainresource set comprises M1 second time domain resource subsets, the firstnode performs blind decoding on all SCI-transmitting candidates in eachof the M1 second time domain resource subsets.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that a second time domain resource set is associatedto the first time-frequency resource set, the second time domainresource set comprises M1 second time domain resource subsets, the firstnode performs blind decoding on all candidates that may transmit SCI ineach of the M1 second time domain resource subsets.

In one embodiment, the phrase that “perform a monitoring on first-typesignalings” means that a second time domain resource set is associatedto the first time-frequency resource set, the second time domainresource set comprises M1 second time domain resource subsets, the firstnode performs blind decoding on given SCI format(s) within REs occupiedby all candidates that may transmit SCI in each of the M1 second timedomain resource subsets.

In one subembodiment of the above three embodiments, the blind decodingincludes: a given second time domain resource subset is any of the M1second time domain resource subsets, the given second time domainresource subset comprises a positive integer number of candidates thatmay transmit SCI, the first node is not aware which candidate the SCIoccupies before the SCI is detected.

In one subembodiment of the above three embodiments, the blind decodingincludes: a candidate which may be occupied by a piece of SCI has a treestructure.

In one embodiment, a physical layer channel occupied by the first radiosignal includes a PSFCH.

In one embodiment, the first time-frequency resource set comprises apositive integer number of REs.

In one embodiment, a second time domain resource set comprises M1 secondtime domain resource subsets, the K1 first-type signalings arerespectively transmitted in K1 of the M1 second time domain resourcesubsets; a transmitter of the K1 first-type signalings is a second node,the second node transmits M1 first-type signalings respectively in theM1 second time domain resource subsets, any of the K1 first-typesignalings is one of the M1 first-type signalings; the first nodedetects the K1 of the M1 first-type signalings; the M1 is a positiveinteger not less than the K1.

In one subembodiment, any of the M1 second time domain resource subsetsoccupies a positive integer number of multicarrier symbol(s) in timedomain.

In one subembodiment, any of the M1 second time domain resource subsetscomprises a search space for SCI.

In one subembodiment, any of the M1 second time domain resource subsetscomprises a Control Resource Set (CORESET) for SCI.

In one subembodiment, each of the M1 first-type signalings indicates thefirst time-frequency resource set.

In one subembodiment, each of the M1 second time domain resource subsetsis associated to the first time-frequency resource set.

In one subembodiment, the M1 is greater than the K1, the first node doesnot correctly detect M1-K1 first-type signaling(s) of the M1 first-typesignalings.

In one subsidiary embodiment of the above subembodiment, the firstsignaling is a last first-type signaling of the M1 first-type signalingsin time domain; the first radio signal is used for determining thatthere is(are) first-type signaling(s) not having been correctly decodedin the M1 first-type signalings; or, the first radio signal is used fordetermining that there is not any first-type signaling not having beencorrectly decoded in the M1 first-type signalings, and at least one ofthe M1 first-type signalings schedules a bit block that is not decodedcorrectly.

In one subsidiary embodiment of the above subembodiment, among the M1first-type signalings there is a first-type signaling located after thefirst signaling in time domain, the second node has transmitted a totalof K2 first-type signalings in a time domain position before the firstsignaling, the K2 is a positive integer greater than the K1 and lessthan the M1; the first signaling is a last first-type signaling of theK2 first-type signalings in time domain; the first radio signal is usedfor determining that there is(are) first-type signaling(s) not havingbeen correctly decoded in the K2 first-type signalings; or, the firstradio signal is used for determining that there is not any first-typesignaling not having been correctly decoded in the K2 first-typesignalings, and at least one of the K2 first-type signalings schedules abit block that is not decoded correctly.

In one example of the above subsidiary embodiment, the second nodedetermines according to the first radio signal whether (M1-K2)first-type signaling(s) of the M1 first-type signalings located afterthe first signaling in time domain is(are) detected by the first node.

Embodiment 2

Embodiment 2 illustrates a schematic diagram of a network architecture,as shown in FIG. 2 .

FIG. 2 is a diagram illustrating a network architecture 200 of 5G NR,Long-Term Evolution (LTE) and Long-Term Evolution Advanced (LTE-A)systems. The 5G NR or LTE network architecture 200 may be called anEvolved Packet System (EPS) 200 or other applicable terminology. The EPS200 may comprise one or more UEs 201, and a UE 241 in sidelinkcommunication with the UE 201, an NG-RAN 202, an Evolved PacketCore/5G-Core Network (EPC/5G-CN) 210, a Home Subscriber Server (HSS) 220and an Internet Service 230. The EPS 200 may be interconnected withother access networks. For simple description, the entities/interfacesare not shown. As shown in FIG. 2 , the EPS 200 provides packetswitching services. Those skilled in the art will find it easy tounderstand that various concepts presented throughout the presentdisclosure can be extended to networks providing circuit switchingservices or other cellular networks. The NG-RAN 202 comprises an NR nodeB (gNB) 203 and other gNBs 204. The gNB 203 provides UE 201 orienteduser plane and control plane protocol terminations. The gNB 203 may beassociated to other gNBs 204 via an Xn interface (for example,backhaul). The gNB 203 may be called a base station, a base transceiverstation, a radio base station, a radio transceiver, a transceiverfunction, a Base Service Set (BSS), an Extended Service Set (ESS), aTransmit-Receive Point (TRP) or some other applicable terms. The gNB 203provides an access point of the EPC/5G-CN 210 for the UE 201. Examplesof UE 201 include cellular phones, smart phones, Session InitiationProtocol (SIP) phones, laptop computers, Personal Digital Assistant(PDA), Satellite Radios, non-terrestrial base station communications,Satellite Mobile Communications, Global Positioning Systems (GPSs),multimedia devices, video devices, digital audio players (for example,MP3 players), cameras, game consoles, unmanned aerial vehicles, airvehicles, narrow-band physical network equipment, machine-typecommunication equipment, land vehicles, automobiles, wearable equipment,or any other devices having similar functions. Those skilled in the artalso can call the UE 201 a mobile station, a subscriber station, amobile unit, a subscriber unit, a wireless unit, a remote unit, a mobiledevice, a wireless device, a radio communication device, a remotedevice, a mobile subscriber station, an access terminal, a mobileterminal, a wireless terminal, a remote terminal, a handset, a userproxy, a mobile client, a client or some other appropriate terms. ThegNB 203 is associated to the EPC/5G-CN 210 via an S1/NG interface. TheEPC/5G-CN 210 comprises a Mobility Management Entity/AuthenticationManagement Field/User Plane Function (MME/AMF/UPF) 211, otherMMEs/AMFs/UPFs 214, a Service Gateway (S-GW) 212 and a Packet DateNetwork Gateway (P-GW) 213. The MME/AMF/UPF 211 is a control node forprocessing a signaling between the UE 201 and the EPC/5G-CN 210.Generally, the MME/AMF/UPF 211 provides bearer and connectionmanagement. All user Internet Protocol (IP) packets are transmittedthrough the S-GW 212, the S-GW 212 is associated to the P-GW 213. TheP-GW 213 provides UE IP address allocation and other functions. The P-GW213 is associated to the Internet Service 230. The Internet Service 230comprises IP services corresponding to operators, specifically includingInternet, Intranet, IP Multimedia Subsystem (IMS) and Packet SwitchingStreaming Services (PSS).

In one embodiment, the UE 201 corresponds to the first node in thepresent disclosure.

In one embodiment, the UE 241 corresponds to the second node in thepresent disclosure.

In one embodiment, an air interface between the UE 201 and the gNB 203is a Uu interface.

In one embodiment, an air interface between the UE 201 and the UE 241 isa PC-5 interface.

In one embodiment, a radio link between the UE 201 and the gNB 203 is acellular network link.

In one embodiment, a radio link between the UE 201 and the UE 241 is asidelink.

In one embodiment, the first node in the present disclosure is the UE201, while the second node in the present disclosure is a terminalcovered by the gNB 203.

In one embodiment, the first node in the present disclosure is the UE201, while the second node in the present disclosure is a terminaluncovered by the gNB 203.

In one embodiment, the first node and the second node in the presentdisclosure are both served by the gNB 203.

In one embodiment, unicast communication is supported between the UE 201and the UE 241.

In one embodiment, broadcast communication is supported between the UE201 and the UE 241.

In one embodiment, groupcast communication is supported between the UE201 and the UE 241.

In one embodiment, the UE 201 and the UE 241 belong to a same terminalgroup, the UE 241 is the group manager for the terminal group, or the UE241 is the group head of the terminal group.

Embodiment 3

Embodiment 3 illustrates a schematic diagram of an embodiment of a radioprotocol architecture of a user plane and a control plane according tothe present disclosure, as shown in FIG. 3 .

FIG. 3 is a schematic diagram illustrating an embodiment of a radioprotocol architecture of a user plane and a control plane. In FIG. 3 ,the radio protocol architecture for a first node and a second node isrepresented by three layers, which are a layer 1, a layer 2 and a layer3, respectively. The layer 1 (L1) is the lowest layer and performssignal processing functions of various PHY layers. The L1 is called PHY301 in the present disclosure. The layer 2 (L2) 305 is above the PHY301, and is in charge of the link between the first node and the secondnode via the PHY 301. In the user plane, L2 305 comprises a MediumAccess Control (MAC) sublayer 302, a Radio Link Control (RLC) sublayer303 and a Packet Data Convergence Protocol (PDCP) sublayer 304. All thethree sublayers terminate at the second node of the network side.Although not described in FIG. 3 , the first node may comprise severalhigher layers above the L2 305, such as a network layer (i.e., IP layer)terminated at a P-GW 213 of the network side and an application layerterminated at the other side of the connection (i.e., a peer UE, aserver, etc.). The PDCP sublayer 304 provides multiplexing amongvariable radio bearers and logical channels. The PDCP sublayer 304 alsoprovides a header compression for a higher-layer packet so as to reducea radio transmission overhead. The PDCP sublayer 304 provides securityby encrypting a packet and provides support for UE handover betweensecond nodes. The RLC sublayer 303 provides segmentation andreassembling of a higher-layer packet, retransmission of a lost packet,and reordering of a packet so as to compensate the disordered receivingcaused by HARQ. The MAC sublayer 302 provides multiplexing between alogical channel and a transport channel. The MAC sublayer 302 is alsoresponsible for allocating between first nodes various radio resources(i.e., resource blocks) in a cell. The MAC sublayer 302 is also incharge of HARQ operation. In the control plane, the radio protocolarchitecture of the first node and the second node is almost the same asthe radio protocol architecture in the user plane on the PHY 301 and theL2 305, but there is no header compression for the control plane. Thecontrol plane also comprises a Radio Resource Control (RRC) sublayer 306in the layer 3 (L3). The RRC sublayer 306 is responsible for acquiringradio resources (i.e., radio bearer) and configuring the lower layerusing an RRC signaling between the second node and the first node.

In one embodiment, the radio protocol architecture in FIG. 3 isapplicable to the first node in the present disclosure.

In one embodiment, the radio protocol architecture in FIG. 3 isapplicable to the second node in the present disclosure.

In one embodiment, any of the M1 first-type signalings in the presentdisclosure is generated by the PHY 301.

In one embodiment, the first radio signal in the present disclosure isgenerated by the PHY 301.

In one embodiment, the first radio signal in the present disclosure isgenerated by the MAC sublayer 302.

In one embodiment, the first information in the present disclosure isgenerated by the MAC sublayer 302.

In one embodiment, the first information in the present disclosure isgenerated by the RRC sublayer 306.

In one embodiment, the first information in the present disclosure isgenerated by an affiliated base station of a cell where the second nodeis located.

In one embodiment, any of the M1 radio signals in the present disclosureis generated by the MAC sublayer 302.

In one embodiment, any of the M1 radio signals in the present disclosureis generated by the PHY 301.

Embodiment 4

Embodiment 4 illustrates a schematic diagram of a first node (firstcommunication device) and a second node (second communication device)according to the present disclosure, as shown in FIG. 4 . FIG. 4 is ablock diagram of a first communication device 450 and a secondcommunication device in communication with each other in an accessnetwork.

The first communication device 450 comprises a controller/processor 459,a memory 460, a data source 467, a transmitting processor 468, areceiving processor 456, a multi-antenna transmitting processor 457, amulti-antenna receiving processor 458, a transmitter/receiver 454 and anantenna 452.

The second communication device 410 comprises a controller/processor475, a memory 476, a receiving processor 470, a transmitting processor416, a multi-antenna receiving processor 472, a multi-antennatransmitting processor 471, a transmitter/receiver 418 and an antenna420.

In a transmission between the second communication device 410 and thefirst communication device 450, at the second communication device 410,a higher layer packet from a core network is provided to thecontroller/processor 475. The controller/processor 475 implements thefunctionality of the L2 layer. The controller/processor 475 providesheader compression, encryption, packet segmentation and reordering, andmultiplexing between a logical channel and a transport channel, andradio resource allocation of the first communication device 450 based onvarious priorities. The controller/processor 475 is also in charge of aretransmission of a lost packet and a signaling to the firstcommunication device 450. The transmitting processor 416 and themulti-antenna transmitting processor 471 perform various signalprocessing functions used for the L1 layer (i.e., PHY). The transmittingprocessor 416 performs coding and interleaving so as to ensure a ForwardError Correction (FEC) at the second communication device 410 side andthe mapping to signal clusters corresponding to each modulation scheme(i.e., BPSK, QPSK, M-PSK, and M-QAM, etc.). The multi-antennatransmitting processor 471 performs digital spatial precoding, whichincludes precoding based on codebook and precoding based onnon-codebook, and beamforming processing on encoded and modulatedsignals to generate one or more spatial streams. The transmittingprocessor 416 then maps each spatial stream into a subcarrier. Themapped symbols are multiplexed with a reference signal (i.e., pilotfrequency) in time domain and/or frequency domain, and then they areassembled through Inverse Fast Fourier Transform (IFFT) to generate aphysical channel carrying time-domain multicarrier symbol streams. Afterthat the multi-antenna transmitting processor 471 performs transmissionanalog precoding/beamforming on the time-domain multicarrier symbolstreams. Each transmitter 418 converts a baseband multicarrier symbolstream provided by the multi-antenna transmitting processor 471 into aradio frequency (RF) stream, which is later provided to differentantennas 420.

In a transmission between the second communication device 410 and thefirst communication device 450, at the first communication device 450,each receiver 454 receives a signal via a corresponding antenna 452.Each receiver 454 recovers information modulated to the RF carrier, andconverts the radio frequency stream into a baseband multicarrier symbolstream to be provided to the receiving processor 456. The receivingprocessor 456 and the multi-antenna receiving processor 458 performsignal processing functions of the L1 layer. The multi-antenna receivingprocessor 458 performs reception analog precoding/beamforming on abaseband multicarrier symbol stream provided by the receiver 454. Thereceiving processor 456 converts the processed baseband multicarriersymbol stream from time domain into frequency domain using FFT. Infrequency domain, a physical layer data signal and a reference signalare de-multiplexed by the receiving processor 456, wherein the referencesignal is used for channel estimation, while the data signal issubjected to multi-antenna detection in the multi-antenna receivingprocessor 458 to recover any first communication device 450-targetedspatial stream. Symbols on each spatial stream are demodulated andrecovered in the receiving processor 456 to generate a soft decision.Then the receiving processor 456 decodes and de-interleaves the softdecision to recover the higher-layer data and control signal transmittedby the second communication device 410 on the physical channel. Next,the higher-layer data and control signal are provided to thecontroller/processor 459. The controller/processor 459 performsfunctions of the L2 layer. The controller/processor 459 can beassociated to a memory 460 that stores program code and data. The memory460 can be called a computer readable medium. In a transmission betweenthe second communication device 410 and the first communication device450, the controller/processor 459 provides demultiplexing between atransport channel and a logical channel, packet reassembling,decrypting, header decompression and control signal processing so as torecover a higher-layer packet from the core network. The higher-layerpacket is later provided to all protocol layers above the L2 layer, orvarious control signals can be provided to the L3 layer for processing.

In a transmission between the first communication device 450 and thesecond communication device 410, at the first communication device 450,the data source 467 is configured to provide a higher-layer packet tothe controller/processor 459. The data source 467 represents allprotocol layers above the L2 layer. Similar to a transmitting functionof the second communication device 410 described in the transmissionbetween the second communication device 410 and the first communicationdevice 450, the controller/processor 459 performs header compression,encryption, packet segmentation and reordering, and multiplexing betweena logical channel and a transport channel based on radio resourceallocation so as to provide the L2 layer functions used for the userplane and the control plane. The controller/processor 459 is alsoresponsible for a retransmission of a lost packet, and a signaling tothe second communication device 410. The transmitting processor 468performs modulation and mapping, as well as channel coding, and themulti-antenna transmitting processor 457 performs digital multi-antennaspatial precoding, including precoding based on codebook and precodingbased on non-codebook, and beamforming. The transmitting processor 468then modulates generated spatial streams intomulticarrier/single-carrier symbol streams. The modulated symbolstreams, after being subjected to analog precoding/beamforming in themulti-antenna transmitting processor 457, are provided from thetransmitter 454 to each antenna 452. Each transmitter 454 first convertsa baseband symbol stream provided by the multi-antenna transmittingprocessor 457 into a radio frequency symbol stream, and then providesthe radio frequency symbol stream to the antenna 452.

In a transmission between the first communication device 450 and thesecond communication device 410, the function of the secondcommunication device 410 is similar to the receiving function of thefirst communication device 450 described in the transmission between thesecond communication device 410 and the first communication device 450.Each receiver 418 receives a radio frequency signal via a correspondingantenna 420, converts the received radio frequency signal into abaseband signal, and provides the baseband signal to the multi-antennareceiving processor 472 and the receiving processor 470. The receivingprocessor 470 and the multi-antenna receiving processor 472 jointlyprovide functions of the L1 layer. The controller/processor 475 providesfunctions of the L2 layer. The controller/processor 475 can beassociated to the memory 476 that stores program code and data. Thememory 476 can be called a computer readable medium. In the transmissionbetween the first communication device 450 and the second communicationdevice 410, the controller/processor 475 provides de-multiplexingbetween a transport channel and a logical channel, packet reassembling,decrypting, header decompression, control signal processing so as torecover a higher-layer packet from the first communication device (UE)450. The higher-layer packet coming from the controller/processor 475may be provided to the core network.

In one embodiment, the first communication device 450 comprises at leastone processor and at least one memory. The at least one memory includescomputer program codes. The at least one memory and the computer programcodes are configured to be used in collaboration with the at least oneprocessor. The first communication device 450 at least performs amonitoring on first-type signalings, in which K1 first-type signalingsare detected; and transmits a first radio signal in a firsttime-frequency resource set; each of the K1 first-type signalings isassociated to the first time-frequency resource set; a first signalingis a last first-type signaling of the K1 first-type signalings in timedomain; the first radio signal is used for determining that thereis(are) first-type signaling(s) associated to the first time-frequencyresource set not having been correctly decoded in a time domain positionbefore the first signaling; the K1 is a positive integer.

In one embodiment, the first communication device 450 comprises at leastone processor and at least one memory. The at least one memory includescomputer program codes. The at least one memory and the computer programcodes are configured to be used in collaboration with the at least oneprocessor. The first communication device 450 at least performs amonitoring on first-type signalings, in which K1 first-type signalingsare detected; and transmits a first radio signal in a firsttime-frequency resource set; each of the K1 first-type signalings isassociated to the first time-frequency resource set; a first signalingis a last first-type signaling of the K1 first-type signalings in timedomain; the first radio signal is used for determining that there is notany first-type signaling associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling, and at least one of the K1 first-type signalingsschedules a bit block that is not decoded correctly; the K1 is apositive integer.

In one embodiment, the first communication device 450 comprises a memorythat stores a computer readable instruction program. The computerreadable instruction program generates an action when executed by atleast one processor. The action includes: performing a monitoring onfirst-type signalings, in which K1 first-type signalings are detected;and transmitting a first radio signal in a first time-frequency resourceset; each of the K1 first-type signalings is associated to the firsttime-frequency resource set; a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded in a time domain position before the firstsignaling; the K1 is a positive integer.

In one embodiment, the first communication device 450 comprises a memorythat stores a computer readable instruction program. The computerreadable instruction program generates an action when executed by atleast one processor. The action includes: performing a monitoring onfirst-type signalings, in which K1 first-type signalings are detected;and transmitting a first radio signal in a first time-frequency resourceset; each of the K1 first-type signalings is associated to the firsttime-frequency resource set; a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is not any first-typesignaling associated to the first time-frequency resource set not havingbeen correctly decoded in a time domain position before the firstsignaling, and at least one of the K1 first-type signalings schedules abit block that is not decoded correctly; the K1 is a positive integer.

In one embodiment, the second communication device 410 comprises atleast one processor and at least one memory. The at least one memoryincludes computer program codes. The at least one memory and thecomputer program codes are configured to be used in collaboration withthe at least one processor. The second communication device 410 at leasttransmits M1 first-type signalings; and monitors a first radio signal ina first time-frequency resource set; each of the M1 first-typesignalings is associated to the first time-frequency resource set; atransmitter of the first radio signal is a first node; the first nodeperforms a monitoring on first-type signalings, in which K1 of the M1first-type signalings are detected, a first signaling is a lastfirst-type signaling of the K1 first-type signalings in time domain; thefirst radio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded by the first node in a time domainposition before the first signaling; the K1 is a positive integer, andthe M1 is a positive integer not less than the K1.

In one embodiment, the second communication device 410 comprises atleast one processor and at least one memory. The at least one memoryincludes computer program codes. The at least one memory and thecomputer program codes are configured to be used in collaboration withthe at least one processor. The second communication device 410 at leasttransmits M1 first-type signalings; and monitors a first radio signal ina first time-frequency resource set; each of the M1 first-typesignalings is associated to the first time-frequency resource set; atransmitter of the first radio signal is a first node; the first nodeperforms a monitoring on first-type signalings, in which K1 of the M1first-type signalings are detected, a first signaling is a lastfirst-type signaling of the K1 first-type signalings in time domain; thefirst radio signal is used for determining that there is not anyfirst-type signaling associated to the first time-frequency resource setnot having been correctly decoded by the first node in a time domainposition before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly by the first node; the K1 is a positive integer, and the M1 isa positive integer not less than the K1.

In one embodiment, the second communication device 410 comprises amemory that stores a computer readable instruction program. The computerreadable instruction program generates an action when executed by atleast one processor. The action includes: transmitting M1 first-typesignalings; and monitoring a first radio signal in a firsttime-frequency resource set; each of the M1 first-type signalings isassociated to the first time-frequency resource set; a transmitter ofthe first radio signal is a first node; the first node performs amonitoring on first-type signalings, in which K1 of the M1 first-typesignalings are detected, a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded by the first node in a time domainposition before the first signaling; the K1 is a positive integer, andthe M1 is a positive integer not less than the K1.

In one embodiment, the second communication device 410 comprises amemory that stores a computer readable instruction program. The computerreadable instruction program generates an action when executed by atleast one processor. The action includes: transmitting M1 first-typesignalings; and monitoring a first radio signal in a firsttime-frequency resource set; each of the M1 first-type signalings isassociated to the first time-frequency resource set; a transmitter ofthe first radio signal is a first node; the first node performs amonitoring on first-type signalings, in which K1 of the M1 first-typesignalings are detected, a first signaling is a last first-typesignaling of the K1 first-type signalings in time domain; the firstradio signal is used for determining that there is not any first-typesignaling associated to the first time-frequency resource set not havingbeen correctly decoded by the first node in a time domain positionbefore the first signaling, and at least one of the K1 first-typesignalings schedules a bit block that is not decoded correctly by thefirst node; the K1 is a positive integer, and the M1 is a positiveinteger not less than the K1.

In one embodiment, the first communication device 450 corresponds to thefirst node in the present disclosure.

In one embodiment, the second communication device 410 corresponds tothe second node in the present disclosure.

In one embodiment, at least one of the antenna 452, the receiver 454,the multi-antenna receiving processor 458 or the receiving processor 456is used for performing a monitoring on first-type signalings, in whichK1 first-type signalings are detected.

In one embodiment, at least one of the antenna 420, the transmitter 418,the multi-antenna transmitting processor 471 or the transmittingprocessor 416 is used for transmitting M1 first-type signalings.

In one embodiment, at least one of the antenna 452, the transmitter 454,the multi-antenna transmitting processor 457, the transmitting processor468 or the controller/processor 459 is used for transmitting a firstradio signal in a first time-frequency resource set; at least one of theantenna 420, the receiver 418, the multi-antenna receiving processor472, the receiving processor 470 or the controller/processor 475 is usedfor monitoring a first radio signal in a first time-frequency resourceset.

In one embodiment, at least one of the antenna 452, the receiver 454,the multi-antenna receiving processor 458 or the receiving processor 456is used for receiving first information; at least one of the antenna420, the transmitter 418, the multi-antenna transmitting processor 471or the transmitting processor 416 is used for transmitting firstinformation.

In one embodiment, at least one of the antenna 452, the receiver 454,the multi-antenna receiving processor 458 or the receiving processor 456is used for receiving K1 radio signals; at least one of the antenna 420,the transmitter 418, the multi-antenna transmitting processor 471 or thetransmitting processor 416 is used for transmitting K1 radio signals.

Embodiment 5

Embodiment 5 illustrates a flowchart of a first radio signal, as shownin FIG. 5 . In FIG. 5 , a first node U1 and a second node U2 are incommunication with each other via sidelink. Steps marked by F0 in FIG. 5are optional.

The first node U1 receives first information in step S10; performs amonitoring on first-type signalings in step S11, in which K1 first-typesignalings are detected; receives K1 radio signals in step S12; andtransmits a first radio signal in a first time-frequency resource set instep S13.

The second node U2 transmits first information in step S20; transmits M1first-type signalings in step S21; transmits M1 radio signals in stepS22; and monitors a first radio signal in a first time-frequencyresource set in step S23.

In Embodiment 5, each of the M1 first-type signalings is associated tothe first time-frequency resource set, any of the K1 first-typesignalings is one of the M1 first-type signalings that is detected bythe first node U1; a first signaling is a last first-type signaling ofthe K1 first-type signalings in time domain; the first radio signal isused for determining that there is(are) first-type signaling(s)associated to the first time-frequency resource set not having beencorrectly decoded in a time domain position before the first signaling;or, the first radio signal is used for determining that there is not anyfirst-type signaling associated to the first time-frequency resource setnot having been correctly decoded in a time domain position before thefirst signaling, and at least one of the K1 first-type signalingsschedules a bit block that is not decoded correctly; the K1 is apositive integer; the M1 is a positive integer not less than the K1; thefirst information is used for indicating a second time domain resourceset, the M1 first-type signalings respectively occupy M1 second timedomain resource subsets in time domain, the second time domain resourceset comprises the M1 second time domain resource subsets; the K1first-type signalings are transmitted by the second node U2 respectivelyin K1 of the M1 second time domain resource subsets; the M1 first-typesignalings are respectively used for scheduling the M1 radio signals, M1bit blocks are used for generating the M1 radio signals; the K1 radiosignals are K1 of the M1 radio signals respectively generated by K1 bitblocks scheduled by the K1 first-type signalings.

In one embodiment, the meaning of the phrase in the present disclosurethat each of the K1 first-type signalings is associated to the firsttime-frequency resource set includes: the K1 is greater than 1, each ofthe K1 first-type signalings indicates the first time-frequency resourceset.

In one subembodiment, the above-mentioned phrase that each of the K1first-type signalings indicates the first time-frequency resource setmeans that each of the K1 first-type signalings comprises a secondfield, the second field is used for indicating a position of time domainresources occupied by the first time-frequency resource set.

In one subembodiment, the above-mentioned phrase that each of the K1first-type signalings indicates the first time-frequency resource setmeans that each of the K1 first-type signalings comprises a secondfield, the second field is used for indicating a position of frequencydomain resources occupied by the first time-frequency resource set.

In one embodiment, the meaning of the phrase in the present disclosurethat each of the K1 first-type signalings is associated to the firsttime-frequency resource set includes: time domain resources occupied byeach of the K1 first-type signalings belong to a second time domainresource set, the second time domain resource set is associated to thefirst time-frequency resource set.

In one subembodiment, the meaning of the above-mentioned phrase that thesecond time domain resource set is associated to the firsttime-frequency resource set includes: the second node of the presentdisclosure indicates via a higher layer signaling that the second timedomain resource set is to be associated to the first time-frequencyresource set.

In one subembodiment, the meaning of the above-mentioned phrase that thesecond time domain resource set is associated to the firsttime-frequency resource set includes: the second time domain resourceset is pre-defined to be associated to the first time-frequency resourceset.

In one subembodiment, the meaning of the above-mentioned phrase that thesecond time domain resource set is associated to the firsttime-frequency resource set includes: the Hybrid Automatic Repeatrequest Acknowledgement (HARQ-ACK) of a data channel scheduled by ascheduling signaling detected in the second time domain resource set istransmitted in the first time-frequency resource set.

In one embodiment, a first bit is used for generating the first radiosignal; the first bit is used for determining that there is(are)first-type signaling(s) associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling.

In one subembodiment, the first bit being equal to 1 is used fordetermining that there is(are) first-type signaling(s) associated to thefirst time-frequency resource set not having been correctly decoded in atime domain position before the first signaling.

In one subembodiment, the first bit being equal to 0 is used fordetermining that there is not any first-type signaling associated to thefirst time-frequency resource set not having been correctly decoded in atime domain position before the first signaling.

In one embodiment, a first bit is used for generating the first radiosignal; the first bit is used for determining that there is not anyfirst-type signaling associated to the first time-frequency resource setnot having been correctly decoded in a time domain position before thefirst signaling, and at least one of the K1 first-type signalingsschedules a bit block that is not decoded correctly.

In one subembodiment, the first bit being equal to 0 is used fordetermining that there is not any first-type signaling associated to thefirst time-frequency resource set not having been correctly decoded in atime domain position before the first signaling, and at least one of theK1 first-type signalings schedules a bit block that is not decodedcorrectly.

In one subembodiment of the above two embodiments, the first radiosignal is generated through the first bit only.

In one subembodiment of the above two embodiments, the first bit is usedfor generating a first sequence, the first sequence is used forgenerating the first radio signal.

In one subsidiary embodiment of the above subembodiment, the firstsequence is a characteristic sequence, a demodulation of the firstsequence is coherent demodulation.

In one subembodiment of the above two embodiments, the first bit is notdetected by the second node U2, the second node U2 assumes that there isnot any first-type signaling associated to the first time-frequencyresource set not having been correctly decoded in a time domain positionbefore the first signaling, and any of the K1 first-type signalingsschedules a bit block having been correctly decoded.

In one embodiment, a first bit is used for generating the first radiosignal; the first bit is used for determining that there is(are)first-type signaling(s) associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling, or, the first bit is used for determining thatthere is not any first-type signaling associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly.

In one subembodiment, the first bit being equal to 1 represents thatthere is(are) first-type signaling(s) associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling; the first bit being equal to0 represents that there is not any first-type signaling associated tothe first time-frequency resource set not having been correctly decodedin a time domain position before the first signaling, and at least oneof the K1 first-type signalings schedules a bit block that is notdecoded correctly.

In one subembodiment, the first bit being equal to 0 represents thatthere is(are) first-type signaling(s) associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling; the first bit being equal to1 represents that there is not any first-type signaling associated tothe first time-frequency resource set not having been correctly decodedin a time domain position before the first signaling, and at least oneof the K1 first-type signalings schedules a bit block that is notdecoded correctly.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource sets, the K1first-type signalings are transmitted by the second node U2 respectivelyin K1 of the K2 second time domain resource subsets; the K2 bits areused for determining that K3 first-type signaling(s) is(are) notcorrectly decoded, the K3 first-type signaling(s) is(are) transmitted bythe second node U2 respectively in K3 second time domain resourcesubset(s) out of the K2 second time domain resource subsets other thanthe K1 second time domain resource subsets, the K3 is a differencebetween the K2 and the K1.

In one subembodiment of the above embodiment, the K2 second time domainresource subsets are the first K2 second time domain resource subsets ofthe M1 second time domain resource subsets in time domain; the secondnode U2 transmits the first signaling in a last second time domainresource subset of the K2 second time domain resource subsets, and thefirst node U1 correctly decodes the first signaling.

In one subembodiment of the above embodiment, the (K2-1) bit(s) of theK2 bits is(are) used for determining that K3 of the K2 first-typesignalings is(are) not correctly decoded, and a last bit of the K2 bitsis used for checking the second bit sequence; the second bit sequence isscrambled by a first characteristic sequence.

In one subembodiment of the above embodiment, the second node U2descrambles through the first characteristic sequence and the firstradio signal is correctly decoded, the second node U2 assumes that thereis(are) first-type signaling(s) associated to the first time-frequencyresource set not having been correctly decoded by the first node U1 in atime domain position before the first signaling.

In one subembodiment of the above embodiment, the first radio signalcomprises a target field, the target field is used for indicating thatthe K2 bits comprised by the first radio signal are to indicate that K3of the K2 first-type signaling(s) is(are) not correctly decoded.

In one subsidiary embodiment of the above subembodiment, the targetfield comprises 1 bit, the 1 bit comprised in the target field beingequal to 1 represents that the K2 bits are used for indicating that K3of the K2 first-type signalings is(are) not correctly decoded.

In one subsidiary embodiment of the above subembodiment, a given bit isany of the first (K2-1) bit(s); the given bit being equal to 1represents that a corresponding first-type signaling is not correctlydecoded, while the given bit being equal to 0 represents that thecorresponding first-type signaling is correctly decoded.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource sets, the K1first-type signalings are transmitted by the second node U2 respectivelyin K1 of the K2 second time domain resource subsets; the K2 bits areused for determining that K4 bit block(s) is(are) not correctly decoded,the K4 bit blocks is(are) respectively used for generating K4 radiosignal(s), the K4 radio signal(s) is(are) respectively scheduled by K4first-type signaling(s) of the K1 first-type signalings, the K4 is apositive integer not greater than the K1.

In one subembodiment of the above embodiment, the K2 second time domainresource subsets are the first K2 second time domain resource subsets ofthe M1 second time domain resource subsets in time domain; the secondnode U2 transmits the first signaling in a last second time domainresource subset of the K2 second time domain resource subsets, and thefirst node U1 correctly decodes the first signaling.

In one subembodiment of the above embodiment, the K2 bits arerespectively associated to K2 bit blocks scheduled by the K2 first-typesignalings, the K2 bits are used for determining that the K4 bitblock(s) of the K2 bit blocks is(are) not correctly decoded.

In one subsidiary embodiment of the above subembodiment, a given bit isthe any bit of the K2 bits; the given bit being equal to 1 representsthat a corresponding bit block is not correctly decoded, while the givenbit being equal to 0 represents that a corresponding bit block iscorrectly decoded.

In one subembodiment of the above embodiment, the second bit sequence isscrambled through a second characteristic sequence, the secondcharacteristic sequence is orthogonal with the first characteristicsequence in the present disclosure.

In one subembodiment of the above embodiment, the second node U2descrambles through the second characteristic sequence and the firstradio signal is correctly decoded, the second node U2 assumes that thereis not any first-type signaling associated to the first time-frequencyresource set not having been correctly decoded by the first node U1 in atime domain position before the first signaling, and at least one of theK1 first-type signalings schedules a bit block that is not decodedcorrectly by the first node U1.

In one subembodiment of the above embodiment, the first radio signalcomprises a target field, the target field is used for indicating thatthe K2 bits comprised in the first radio signal are to indicate that theK4 bit block(s) is(are) not correctly decoded.

In one subsidiary embodiment of the above subembodiment, the targetfield comprises 1 bit, the 1 bit comprised in the target field beingequal to 0 represents that the K2 bits are used for indicating that theK2 bits comprised in the first radio signal are to indicate that the K4bit block(s) is(are) not correctly decoded.

In one embodiment, the second node U2 does not correctly detect thefirst radio signal, the second node U2 assumes that all the M1first-type signalings are correctly detected by the first node U1, andthe K1 bit blocks respectively scheduled by the M1 first-type signalingsare correctly decoded by the first node U1.

In one embodiment, the phrase in the present disclosure that at leastone of the K1 first-type signalings schedules a bit block that is notdecoded correctly means that there is at least one given radio signal inthe K1 radio signals, the given radio signal comprises a CRC sequence,the first node determines through the check on the CRC sequence that abit block that generates the given radio signal is not correctlydecoded.

In one embodiment, the phrase in the present disclosure that at leastone of the K1 first-type signalings schedules a bit block that is notdecoded correctly means that there is at least one given radio signal inthe K1 radio signals, the given radio signal comprises a CRC sequence;the first node, after receiving the given radio signal, employs the CRCsequence comprised by the received given radio signal in the Mod 2Division of the Cyclic Generation Polynomial of the CRC sequence, whichyields a remainder unequal to 0, then the first node assumes that thebit block which generates the given radio signal is not correctlydecoded.

In one embodiment, the phrase in the present disclosure that at leastone of the K1 first-type signalings schedules a bit block that is notdecoded correctly means that there is at least one given radio signal inthe K1 radio signals, a power value of the given radio signal receivedby the first node is less than a second threshold, the first nodeassumes that the bit which generates the given radio signal is notcorrectly decoded.

In one embodiment, the M1 bit blocks are respectively used forgenerating M1 Transmission Blocks (TBs).

In one embodiment, the M1 bit blocks are respectively used forgenerating M1Code Block Groups (CBGs).

In one embodiment, a physical layer channel occupied by any of the M1radio signals is a Physical Sidelink Shared Channel (PSSCH).

In one embodiment, a transport channel occupied by any of the M1 radiosignals is a Sidelink Shared Channel (SL-SCH).

In one embodiment, the phrase in the present disclosure that the firstfield is used for determining a sequence number of the given first-typesignaling in the M1 first-type signalings includes: the first field isused for determining where the given first-type signaling ranks in theM1 first-type signalings.

In one embodiment, the phrase in the present disclosure that the firstfield is used for determining a sequence number of the given first-typesignaling in the M1 first-type signalings includes: the given first-typesignaling ranks the i-th in the M1 first-type signalings, the firstfield is used for indicating (i−1), the i is an integer no less than 0and less than M1.

In one embodiment, the first signaling is the K2-th first-type signalingof the M1 first-type signalings, a first field comprised in the firstsignaling indicates (K2-1), the first field of the first signalingindicates that the first signaling is the K2-th first-type signaling ofall first-type signalings associated to the first time-frequencyresource set; the K2 is a positive integer no less than the K1.

In one subembodiment, the first node U1 transmits the first radio signalin the first time-frequency resource set, the first radio signal onlycomprises the first bitmap; when the K2 is equal to the M1, the secondnode U2 determines that the first node U1 does not miss detection onremaining first-type signaling(s) associated to the first time-frequencyresource set after detecting the first signaling; or when the K2 is lessthan the M1, the second node U2 determines that the first node U1 missesdetection on remaining first-type signaling(s) associated to the firsttime-frequency resource set after detecting the first signaling; theremaining first-type signaling(s) is(are) (M1-K2) first-typesignaling(s) out of the M1 first-type signalings located after the firstsignaling in time domain.

In one subembodiment, the first node U1 transmits the first radio signalin the first time-frequency resource set, the first radio signalcomprises the first bitmap and the second bitmap; the first radio signalalso comprises a target field, the target field is used for indicatingthe K2; when the K2 is equal to the M1, the second node U2 determinesthat the first node U1 does not miss detection on remaining first-typesignaling(s) associated to the first time-frequency resource set afterdetecting the first signaling; or when the K2 is less than the M1, thesecond node U2 determines that the first node U1 misses detection onremaining first-type signaling(s) associated to the first time-frequencyresource set after detecting the first signaling; the remainingfirst-type signaling(s) is(are) (M1-K2) first-type signaling(s) out ofthe M1 first-type signalings located after the first signaling in timedomain.

In one embodiment, the first radio signal comprises a target field, thetarget field is used for indicating a number of bits comprised by thefirst bitmap.

In one embodiment, the first radio signal comprises a target field, thetarget field is used for indicating the K2.

In one embodiment, the first field comprises Q1 bit(s), the Q1 is aminimum positive integer not less than log 2(M1).

In one embodiment, the multicarrier symbol in the present disclosure isan Orthogonal Frequency Division Multiplexing (OFDM) symbol.

In one embodiment, the multicarrier symbol in the present disclosure isa Single-Carrier Frequency Division Multiple Access (SC-FDMA) symbol.

In one embodiment, the multicarrier symbol in the present disclosure isa Filter Bank Multi Carrier (FBMC) symbol.

In one embodiment, the multicarrier symbol in the present disclosure isa Cyclic Prefix (CP)-including OFDM symbol.

In one embodiment, the multicarrier symbol in the present disclosure isone of CP-including Discrete Fourier Transform Spreading OrthogonalFrequency Division Multiplexing (DFT-s-OFDM) symbols.

In one embodiment, the first information is transmitted via an RRCsignaling.

In one embodiment, the first information is information for a PC-5interface.

In one embodiment, the first node U1 is a terminal.

In one embodiment, the first node U1 is a UE.

In one embodiment, the first node U1 is a vehicle.

In one embodiment, the first node U1 is a Road Side Unit (RSU).

In one embodiment, the first node U2 is a terminal.

In one embodiment, the first node U2 is a UE.

In one embodiment, the first node U2 is a vehicle.

In one embodiment, the first node U2 is an RSU.

In one embodiment, a given terminal group comprises the first node U1and the second node U2, the first node U1 is a terminal of the giventerminal group; the second node U2 is a Group Head (GH), or the secondnode U2 is a Group Manager (GM).

In one embodiment, the meaning of the phrase that monitoring a firstradio signal in a first time-frequency resource set includes: the secondnode U2 detects the first radio signal in the first time-frequencyresource set.

In one embodiment, the meaning of the phrase that monitoring a firstradio signal in a first time-frequency resource set includes: the secondnode U2 successfully decodes the first radio signal in the firsttime-frequency resource set.

In one embodiment, the meaning of the phrase that monitoring a firstradio signal in a first time-frequency resource set includes: the secondnode U2 receives the first radio signal in the first time-frequencyresource set.

In one embodiment, the first information is transmitted via an airinterface.

In one embodiment, the first information is transmitted via an interfacebetween the UE 201 and the UE 241 in Embodiment 2.

Embodiment 6

Embodiment 6 illustrates a schematic diagram of a first time-frequencyresource set, as shown in FIG. 6 . In FIG. 6 , the first time-frequencyresource set and the second time domain resource set are associated; thesecond time domain resource set comprises M1 second time domain resourcesubsets, and the second node in the present disclosure transmits M1first-type signalings respectively in the M1 second time domain resourcesubsets; the M1 first-type signalings are respectively used forscheduling M1 radio signals.

In one embodiment, any of the M1 second time domain resource subsetsoccupies a positive integer number of consecutive multicarrier symbols.

In one embodiment, the first time-frequency resource set and the secondtime domain resource set are configured by a higher layer signaling.

In one embodiment, the first time-frequency resource set occupies apositive integer number of multicarrier symbols in time domain, and apositive integer number of consecutive subcarriers in frequency domain.

Embodiment 7

Embodiment 7 illustrates a schematic diagram of a second time domainresource set, as shown in FIG. 7 . In FIG. 7 , the second time domainresource set comprises M1 second time domain resource subsets; among theM1 second time domain resource subsets the first K2 second time domainresource subsets in time domain are the K2 second time domain resourcesubsets in the present disclosure, and a second time domain resourcesubset occupied by the first signaling in the present disclosure is alast second time domain resource subset of the K2 second time domainresource subsets.

In one embodiment, the first node in the present disclosure does notdetect first-type signalings in any of the M1 second time domainresource subsets located after the second time domain resource subsetoccupied by the first signaling.

In one embodiment, the M1 second time domain resource subsets arediscrete in time domain.

In one embodiment, a number of bits comprised in the second bit sequencein the present disclosure is related to where the second time domainresource subset occupied by the first signaling ranks in the M1 secondtime domain resource subsets.

In one embodiment, a number of bits comprised in the second bit sequencein the present disclosure is related to a value indicated by the firstfield of the first signaling.

Embodiment 8

Embodiment 8 illustrates a schematic diagram of a second time domainresource set, as shown in FIG. 8 . In FIG. 8 , the second time domainresource set comprises M1 second time domain resource subsets; thesecond node transmits the first signaling in a last second time domainresource subset of the M1 second time domain resource subsets, and thefirst node detects the first signaling.

In one embodiment, the M1 second time domain resource subsets arediscrete in time domain.

In one embodiment, a number of bits comprised in the second bit sequencein the present disclosure is equal to M1.

Embodiment 9

Embodiment 9 illustrates a schematic diagram of M1 first-type signaling,as shown in FIG. 9 . In FIG. 9 , K1 of the M1 first-type signalings aredetected by the first node; a first signaling is a last first-typesignaling of the K1 first-type signalings; before the first signaling,the second node has altogether transmitted K2 first-type signalings, andK3 of the K2 first-type signalings is(are) not detected by the firstnode; the K3 first-type signaling(s) is(are) K3 first-type signaling(s)out of the K2 first-type signalings other than the K1 first-typesignalings; the K3 is a difference between the K2 and the K1.

Embodiment 10

Embodiment 10 illustrates a schematic diagram of a first radio signal,as shown in FIG. 10 . In FIG. 10 , a second bit sequence is used forgenerating the first radio signal; the second bit sequence comprises K2bits, the K2 bits are used for determining that K3 first-typesignaling(s) is(are) not correctly decoded, the K3 first-typesignaling(s) is(are) transmitted by the transmitter of the K1 first-typesignalings respectively in K3 second time domain resource subset(s) outof the K2 second time domain resource subsets other than the K1 secondtime domain resource subsets, the K3 is the difference between the K2and the K1; the K2 bits respectively correspond to bit #1 through bit #2in FIG. 10 .

In one embodiment, the first (K2-1) bit(s) respectivelycorresponds(correspond) to the first (K2-1) first-type signaling(s); agiven bit is any of the first (K2-1) bit(s), the given bit being equalto 1 represents that a corresponding first-type signaling is notcorrectly detected, or the given bit being equal to 0 represents that acorresponding first-type signaling is correctly detected.

In one embodiment, the first (K2-1) bit(s) respectivelycorresponds(correspond) to the first (K2-1) first-type signaling(s); agiven bit is any of the first (K2-1) bit(s), the given bit being equalto 0 represents that a corresponding first-type signaling is notcorrectly detected, or the given bit being equal to 1 represents that acorresponding first-type signaling is correctly detected.

In one embodiment, a last bit of the K2 bits being equal to 1 representsthat there is(are) a bit(s) not having been correctly decoded in K1 bitblocks scheduled by the K1 first-type signalings, or the given bit beingequal to 0 represents that there is not any bit block not having beencorrectly decoded in K1 bit blocks scheduled by the K1 first-typesignalings.

In one embodiment, a last bit of the K2 bits being equal to 0 representsthat there is(are) a bit(s) not having been correctly decoded in K1 bitblocks scheduled by the K1 first-type signalings, or the given bit beingequal to 1 represents that there is not any bit block not having beencorrectly decoded in K1 bit blocks scheduled by the K1 first-typesignalings.

In one embodiment, the second node determines according to the number ofbits comprised in the second bit sequence whether the first node missesdetection on any of the M1 first-type signalings located behind thefirst signaling after the K2 first-type signalings have been detected.

In one subembodiment, the number of bits comprised in the second bitsequence is equal to M1, the second node determines that the first nodedoes not miss detection on any of the M1 first-type signalings locatedbehind the first signaling after the K2 first-type signalings have beendetected.

In one subembodiment, the number of bits comprised in the second bitsequence is unequal to M1, the second node determines that the firstnode misses detection on a first-type signaling(s) of the M1 first-typesignalings located behind the first signaling after the K2 first-typesignalings have been detected.

In one embodiment, the second bit sequence is scrambled through a firstcharacteristic sequence.

In one embodiment, the first radio signal comprises a target field, thetarget field is used for indicating that K2 bits comprised in the secondbit sequence are used for determining that the K3 first-typesignaling(s) is(are) not correctly decoded.

Embodiment 11

Embodiment 11 illustrates another schematic diagram of a first radiosignal, as shown in FIG. 11 . In FIG. 11 , the second bit sequencecomprises K2 bits, the K2 bits are used for determining that K4 bitblock(s) is(are) not correctly decoded, the K4 bit block(s) is(are)respectively used for generating K4 radio signal(s), the K4 radiosignal(s) is(are) respectively scheduled by K4 of the K1 first-typesignalings, the K4 is a positive integer no greater than the K1.

In one embodiment, the K2 bits respectively correspond to the K2 bitblocks respectively scheduled by the K2 first-type signalings; a givenbit is any of the K2 bits, the given bit being equal to 1 representsthat a corresponding first-type signaling is not correctly decoded, orthe given bit being equal to 0 represents that a correspondingfirst-type signaling is correctly decoded.

In one embodiment, the K2 bits respectively correspond to the K2 bitblocks respectively scheduled by the K2 first-type signalings; a givenbit is any of the K2 bits, the given bit being equal to 0 representsthat a corresponding first-type signaling is not correctly decoded, orthe given bit being equal to 1 represents that a correspondingfirst-type signaling is correctly decoded.

In one embodiment, the second bit sequence is scrambled through a secondcharacteristic sequence.

In one embodiment, the first radio signal comprises a target field, thetarget field is used for indicating that K2 bits comprised in the secondbit sequence are used for determining that the K4 bit block(s) is(are)not correctly decoded.

Embodiment 12

Embodiment 12 illustrates a schematic diagram of a first node and asecond node, as shown in FIG. 12 . In FIG. 12 , the first node and thesecond node both belong to a given terminal group; the given terminalgroup comprises a positive integer number of terminals, and the secondnode is the group manager for the given terminal group; the area markedwith dotted lines represents the coverage of the given terminal group; athird node in FIG. 12 is a node of the given terminal group other thanthe first node and the second node.

In one embodiment, the first node and the second node are in V2Xcommunication with each other.

In one embodiment, a base station configures the K1 first-typetime-frequency resource sets and then sends the configurationinformation to the second node.

In one embodiment, a base station configures the K1 second-typetime-frequency resource sets and then sends the configurationinformation to the second node.

Embodiment 13

Embodiment 13 illustrates a structure block diagram of a processingdevice in a first node, as shown in FIG. 13 . In FIG. 13 , theprocessing device in a first node 1300 comprises a first receiver 1301and a first transmitter 1302:

The first receiver 1301, performing a monitoring on first-typesignalings, in which K1 first-type signalings are detected; and

the first transmitter 1302, transmitting a first radio signal in a firsttime-frequency resource set;

In Embodiment 13, each of the K1 first-type signalings is associated tothe first time-frequency resource set; a first signaling is a lastfirst-type signaling of the K1 first-type signalings in time domain; thefirst radio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded in a time domain position before the firstsignaling; or, the first radio signal is used for determining that thereis not any first-type signaling associated to the first time-frequencyresource set not having been correctly decoded in a time domain positionbefore the first signaling, and at least one of the K1 first-typesignalings schedules a bit block that is not decoded correctly; the K1is a positive integer.

In one embodiment, the above phrase that each of the K1 first-typesignalings is associated to the first time-frequency resource set meansthat the K1 is greater than 1, each of the K1 first-type signalingsindicates the first time-frequency resource set.

In one embodiment, the above phrase that each of the K1 first-typesignalings is associated to the first time-frequency resource set meansthat time domain resources occupied by each of the K1 first-typesignalings belong to a second time domain resource set, the second timedomain resource set is associated to the first time-frequency resourceset.

In one embodiment, a first bit is used for generating the first radiosignal; the first bit is used for determining that there is(are)first-type signaling(s) associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling; or, the first bit is used for determining thatthere is not any first-type signaling associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource sets, the K1first-type signalings are transmitted by the transmitter of the K1first-type signalings respectively in K1 of the K2 second time domainresource subsets; the K2 bits are used for determining that K3first-type signaling(s) is(are) not correctly decoded, the K3 first-typesignaling(s) is(are) transmitted by the transmitter of the K1 first-typesignalings respectively in K3 second time domain resource subset(s) outof the K2 second time domain resource subsets other than the K1 secondtime domain resource subsets, the K3 is a difference between the K2 andthe K1.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource sets, the K1first-type signalings are transmitted by the second node U2 respectivelyin K1 of the K2 second time domain resource subsets; the K2 bits areused for determining that K4 bit block(s) is(are) not correctly decoded,the K4 bit blocks is(are) respectively used for generating K4 radiosignal(s), the K4 radio signal(s) is(are) respectively scheduled by K4first-type signaling(s) of the K1 first-type signalings, the K4 is apositive integer not greater than the K1.

In one embodiment, the first receiver 1301 receives K1 radio signals;the K1 first-type signalings are respectively used for scheduling the K1radio signals, K1 bit blocks are used for generating the K1 radiosignals.

In one embodiment, each of the M1 first-type signalings is associated tothe first time-frequency resource set, any of the K1 first-typesignalings is one of the M1 first-type signalings; a given first-typesignaling is any of the M1 first-type signalings, the given first-typesignaling comprises a first field, the first field is used fordetermining a sequence number of the given first-type signaling in theM1 first-type signalings; the M1 is a positive integer not less than theK1.

In one embodiment, the first receiver 1301 comprises at least the first4 of the antenna 452, the receiver 454, the multi-antenna receivingprocessor 458, the receiving processor 456 and the controller/processor459 in Embodiment 4.

In one embodiment, the first transmitter 1302 comprises at least thefirst 4 of the antenna 452, the transmitter 454, the multi-antennatransmitting processor 457, the transmitting processor 468 and thecontroller/processor 459 in Embodiment 4.

Embodiment 14

Embodiment 14 illustrates a structure block diagram of a processingdevice in a second node, as shown in FIG. 14 . In FIG. 14 , theprocessing device in a second node 1400 comprises a second transmitter1401 and a second receiver 1402:

The second transmitter 1401, transmitting M1 first-type signalings; and

the second receiver 1402, monitoring a first radio signal in a firsttime-frequency resource set.

In Embodiment 14, each of the M1 first-type signalings is associated tothe first time-frequency resource set; a transmitter of the first radiosignal is a first node; the first node performs a monitoring onfirst-type signalings, in which K1 of the M1 first-type signalings aredetected, a first signaling is a last first-type signaling of the K1first-type signalings in time domain; the first radio signal is used fordetermining that there is(are) first-type signaling(s) associated to thefirst time-frequency resource set not having been correctly decoded bythe first node in a time domain position before the first signaling; or,the first radio signal is used for determining that there is not anyfirst-type signaling associated to the first time-frequency resource setnot having been correctly decoded by the first node in a time domainposition before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly; the K1 is a positive integer; the M1 is a positive integernot less than the K1.

In one embodiment, the meaning of the above phrase that each of the M1first-type signalings is associated to the first time-frequency resourceset includes: the M1 is greater than 1, each of the M1 first-typesignalings indicates the first time-frequency resource set.

In one embodiment, the meaning of the above phrase that each of the M1first-type signalings is associated to the first time-frequency resourceset includes: time domain resources occupied by each of the M1first-type signalings belong to a second time domain resource set, thesecond time domain resource set is associated to the firsttime-frequency resource set.

In one embodiment, a first bit is used for generating the first radiosignal; the first bit is used for determining that there is(are)first-type signaling(s) associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling; or, the first bit is used for determining thatthere is not any first-type signaling associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly by the first node.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource sets, the K1first-type signalings are transmitted by the transmitter of the K1first-type signalings respectively in K1 of the K2 second time domainresource subsets; the K2 bits are used for determining that K3first-type signaling(s) is(are) not correctly decoded, the K3 first-typesignaling(s) is(are) transmitted by the transmitter of the K1 first-typesignalings respectively in K3 second time domain resource subset(s) outof the K2 second time domain resource subsets other than the K1 secondtime domain resource subsets, the K3 is a difference between the K2 andthe K1.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises K2 bits, the K2 isa positive integer not less than the K1; K2 second time domain resourcesubsets are associated to the first time-frequency resource set, the K1first-type signalings are transmitted by a transmitter of the K1first-type signalings respectively in K1 out of K2 second time domainresource subsets; the K2 bits are used for determining that K4 bitblock(s) is(are) not correctly decoded, the K4 bit blocks is(are)respectively used for generating K4 radio signal(s), the K4 radiosignal(s) is(are) respectively scheduled by K4 first-type signaling(s)of the K1 first-type signalings, the K4 is a positive integer notgreater than the K1.

In one embodiment, a second bit sequence is used for generating thefirst radio signal; the second bit sequence comprises a first bitmap,the first bitmap comprises K2 bits; the K2 is a positive integer notless than the K1; K2 second time domain resource subsets are associatedto the first time-frequency resource set, the K1 first-type signalingsare transmitted by a transmitter of the K1 first-type signalingsrespectively in K1 out of K2 second time domain resource subsets; thefirst bitmap is used for determining that K3 first-type signaling(s)is(are) not correctly decoded, the K3 first-type signaling(s) is(are)transmitted by the transmitter of the K1 first-type signalingsrespectively in K3 second time domain resource subset(s) out of the K2second time domain resource subsets other than the K1 second time domainresource subsets, the K3 is a difference between the K2 and the K1.

In one embodiment, the second transmitter 1401 transmits M1 radiosignals; the M1 first-type signalings are respectively used forscheduling the M1 radio signals, M1 bit blocks are used for generatingthe M1 radio signals.

In one embodiment, any of the K1 first-type signalings is one of the M1first-type signalings; a given first-type signaling is any of the M1first-type signalings, the given first-type signaling comprises a firstfield, the first field is used for determining a sequence number of thegiven first-type signaling in the M1 first-type signaling.

In one embodiment, the second transmitter 1401 comprises at least thefirst 4 of the antenna 420, the transmitter 418, the multi-antennatransmitting processor 471, the transmitting processor 416 and thecontroller/processor 475 in Embodiment 4.

In one embodiment, the second receiver 1402 comprises at least the first4 of the antenna 420, the receiver 418, the multi-antenna receivingprocessor 472, the receiving processor 470 and the controller/processor475 in Embodiment 4.

The ordinary skill in the art may understand that all or part of stepsin the above method may be implemented by instructing related hardwarethrough a program. The program may be stored in a computer readablestorage medium, for example Read-Only-Memory (ROM), hard disk or compactdisc, etc. Optionally, all or part of steps in the above embodimentsalso may be implemented by one or more integrated circuits.Correspondingly, each module unit in the above embodiment may beimplemented in the form of hardware, or in the form of software functionmodules. The present disclosure is not limited to any combination ofhardware and software in specific forms. The first node and the secondnode in the present disclosure include but are not limited to mobilephones, tablet computers, notebooks, network cards, low-consumptionequipment, enhanced MTC (eMTC) terminals, NB-IOT terminals,vehicle-mounted communication equipment, vehicles, automobiles, RSU,aircrafts, diminutive airplanes, unmanned aerial vehicles,telecontrolled aircrafts, etc. The base station in the presentdisclosure includes but is not limited to macro-cellular base stations,micro-cellular base stations, home base stations, relay base station,eNB, gNB, Transmitter Receiver Point (TRP), GNSS, relay satellites,satellite base stations, space base stations, RSU and other radiocommunication equipment.

The above are merely the preferred embodiments of the present disclosureand are not intended to limit the scope of protection of the presentdisclosure. Any modification, equivalent substitute and improvement madewithin the spirit and principle of the present disclosure are intendedto be included within the scope of protection of the present disclosure.

What is claimed is:
 1. A method in a first node for wirelesscommunication, comprising: performing a monitoring on first-typesignalings, in which K1 first-type signalings are detected; andtransmitting a first radio signal in a first time-frequency resourceset; wherein each of the K1 first-type signalings is associated to thefirst time-frequency resource set; a first signaling is a lastfirst-type signaling of the K1 first-type signalings in time domain; thefirst radio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded in a time domain position before the firstsignaling; or, the first radio signal is used for determining that thereis not any first-type signaling associated to the first time-frequencyresource set not having been correctly decoded in a time domain positionbefore the first signaling, and at least a bit block scheduled by one ofthe K1 first-type signaling is not decoded correctly; the K1 is apositive integer; a physical layer channel occupied by any of the K1first-type signalings includes a Physical Sidelink Control Channel; aphysical layer channel occupied by the first radio signal includes aPhysical Sidelink Feedback Channel.
 2. The method in the first nodeaccording to claim 1, wherein the phrase that each of the K1 first-typesignalings is associated to the first time-frequency resource set meansthat the K1 is greater than 1, each of the K1 first-type signalingsindicates the first time-frequency resource set; or, the phrase thateach of the K1 first-type signalings is associated to the firsttime-frequency resource set means that time domain resources occupied byeach of the K1 first-type signalings belong to a second time domainresource set, the second time domain resource set is associated to thefirst time-frequency resource set.
 3. The method in the first nodeaccording to claim 1, wherein a first bit is used for generating thefirst radio signal; the first bit is used for determining that thereis(are) first-type signaling(s) associated to the first time-frequencyresource set not having been correctly decoded in a time domain positionbefore the first signaling; or, the first bit is used for determiningthat there is not any first-type signaling associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling, and at least one of the K1first-type signalings schedules a bit block that is not decodedcorrectly.
 4. The method according to claim 1, wherein a second bitsequence is used for generating the first radio signal; the second bitsequence comprises K2 bits, the K2 is a positive integer not less thanthe K1; K2 second time domain resource subsets are associated to thefirst time-frequency resource set, the K1 first-type signalings aretransmitted by a transmitter of the K1 first-type signalingsrespectively in K1 out of K2 second time domain resource subsets; the K2bits are used for determining one of the following cases: K3 first-typesignaling(s) is(are) not correctly decoded, the K3 first-typesignaling(s) is(are) transmitted by the transmitter of the K1 first-typesignalings respectively in K3 second time domain resource subset(s) outof the K2 second time domain resource subsets other than the K1 secondtime domain resource subsets, the K3 is a difference between the K2 andthe K1; K4 bit block(s) is(are) not correctly decoded, the K4 bit blocksis(are) respectively used for generating K4 radio signal(s), the K4radio signal(s) is(are) respectively scheduled by K4 first-typesignaling(s) of the K1 first-type signalings, the K4 is a positiveinteger not greater than the K1.
 5. The method according to claim 1,comprising: receiving K1 radio signals; wherein the K1 first-typesignalings are respectively used for scheduling the K1 radio signals, K1bit blocks are used for generating the K1 radio signals; or, each of theM1 first-type signalings is associated to the first time-frequencyresource set, any of the K1 first-type signalings is one of the M1first-type signalings; a given first-type signaling is any of the M1first-type signalings, the given first-type signaling comprises a firstfield, the first field is used for determining a sequence number of thegiven first-type signaling in the M1 first-type signalings; the M1 is apositive integer not less than the K1.
 6. A method in a second node forwireless communication, comprising: transmitting M1 first-typesignalings; and monitoring a first radio signal in a firsttime-frequency resource set; wherein each of the M1 first-typesignalings is associated to the first time-frequency resource set; atransmitter of the first radio signal is a first node; the first nodeperforms a monitoring on first-type signalings, in which K1 of the M1first-type signalings are detected, a first signaling is a lastfirst-type signaling of the K1 first-type signalings in time domain; thefirst radio signal is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded by the first node in a time domainposition before the first signaling; or, the first radio signal is usedfor determining that there is not any first-type signaling associated tothe first time-frequency resource set not having been correctly decodedby the first node in a time domain position before the first signaling,and at least a bit block scheduled by one of the K1 first-type signalingis not decoded correctly; the K1 is a positive integer, and the M1 is apositive integer not less than the K1; a physical layer channel occupiedby any of the K1 first-type signalings includes a Physical SidelinkControl Channel; a physical layer channel occupied by the first radiosignal includes a Physical Sidelink Feedback Channel.
 7. The method inthe second node according to claim 6, wherein the phrase that each ofthe K1 first-type signalings is associated to the first time-frequencyresource set means that the K1 is greater than 1, each of the K1first-type signalings indicates the first time-frequency resource set;or, the phrase that each of the K1 first-type signalings is associatedto the first time-frequency resource set means that time domainresources occupied by each of the K1 first-type signalings belong to asecond time domain resource set, the second time domain resource set isassociated to the first time-frequency resource set.
 8. The method inthe second node according to claim 6, wherein a first bit is used forgenerating the first radio signal; the first bit is used for determiningthat there is(are) first-type signaling(s) associated to the firsttime-frequency resource set not having been correctly decoded in a timedomain position before the first signaling; or, the first bit is usedfor determining that there is not any first-type signaling associated tothe first time-frequency resource set not having been correctly decodedin a time domain position before the first signaling, and at least oneof the K1 first-type signalings schedules a bit block that is notdecoded correctly.
 9. The method in the second node according to claim6, wherein a second bit sequence is used for generating the first radiosignal; the second bit sequence comprises K2 bits, the K2 is a positiveinteger not less than the K1; K2 second time domain resource subsets areassociated to the first time-frequency resource set, the K1 first-typesignalings are transmitted by a transmitter of the K1 first-typesignalings respectively in K1 out of K2 second time domain resourcesubsets; the K2 bits are used for determining one of the followingcases: K3 first-type signaling(s) is(are) not correctly decoded, the K3first-type signaling(s) is(are) transmitted by the transmitter of the K1first-type signalings respectively in K3 second time domain resourcesubset(s) out of the K2 second time domain resource subsets other thanthe K1 second time domain resource subsets, the K3 is a differencebetween the K2 and the K1; K4 bit block(s) is(are) not correctlydecoded, the K4 bit blocks is(are) respectively used for generating K4radio signal(s), the K4 radio signal(s) is(are) respectively scheduledby K4 first-type signaling(s) of the K1 first-type signalings, the K4 isa positive integer not greater than the K1.
 10. The method in the secondnode according to claim 6, comprising: transmitting M1 radio signals;wherein the M1 first-type signalings are respectively used forscheduling the M1 radio signals, M1 bit blocks are used for generatingthe M1 radio signals; or, each of the M1 first-type signalings isassociated to the first time-frequency resource set, any of the K1first-type signalings is one of the M1 first-type signalings; a givenfirst-type signaling is any of the M1 first-type signalings, the givenfirst-type signaling comprises a first field, the first field is usedfor determining a sequence number of the given first-type signaling inthe M1 first-type signaling.
 11. A first node for wirelesscommunication, comprising: a first receiver, performing a monitoring onfirst-type signalings, in which K1 first-type signalings are detected;and a first transmitter, transmitting a first radio signal in a firsttime-frequency resource set; wherein each of the K1 first-typesignalings is associated to the first time-frequency resource set; afirst signaling is a last first-type signaling of the K1 first-typesignalings in time domain; the first radio signal is used fordetermining that there is(are) first-type signaling(s) associated to thefirst time-frequency resource set not having been correctly decoded in atime domain position before the first signaling; or, the first radiosignal is used for determining that there is not any first-typesignaling associated to the first time-frequency resource set not havingbeen correctly decoded in a time domain position before the firstsignaling, and at least a bit block scheduled by one of the K1first-type signaling is not decoded correctly; the K1 is a positiveinteger; a physical layer channel occupied by any of the K1 first-typesignalings includes a Physical Sidelink Control Channel; a physicallayer channel occupied by the first radio signal includes a PhysicalSidelink Feedback Channel.
 12. The first node according to claim 11,wherein the phrase that each of the K1 first-type signalings isassociated to the first time-frequency resource set means that the K1 isgreater than 1, each of the K1 first-type signalings indicates the firsttime-frequency resource set; or, the phrase that each of the K1first-type signalings is associated to the first time-frequency resourceset means that time domain resources occupied by each of the K1first-type signalings belong to a second time domain resource set, thesecond time domain resource set is associated to the firsttime-frequency resource set.
 13. The first node according to claim 11,wherein a first bit is used for generating the first radio signal; thefirst bit is used for determining that there is(are) first-typesignaling(s) associated to the first time-frequency resource set nothaving been correctly decoded in a time domain position before the firstsignaling; or, the first bit is used for determining that there is notany first-type signaling associated to the first time-frequency resourceset not having been correctly decoded in a time domain position beforethe first signaling, and at least one of the K1 first-type signalingsschedules a bit block that is not decoded correctly.
 14. The first nodeaccording to claim 11, wherein a second bit sequence is used forgenerating the first radio signal; the second bit sequence comprises K2bits, the K2 is a positive integer not less than the K1; K2 second timedomain resource subsets are associated to the first time-frequencyresource set, the K1 first-type signalings are transmitted by atransmitter of the K1 first-type signalings respectively in K1 out of K2second time domain resource subsets; the K2 bits are used fordetermining one of the following cases: K3 first-type signaling(s)is(are) not correctly decoded, the K3 first-type signaling(s) is(are)transmitted by the transmitter of the K1 first-type signalingsrespectively in K3 second time domain resource subset(s) out of the K2second time domain resource subsets other than the K1 second time domainresource subsets, the K3 is a difference between the K2 and the K1; K4bit block(s) is(are) not correctly decoded, the K4 bit blocks is(are)respectively used for generating K4 radio signal(s), the K4 radiosignal(s) is(are) respectively scheduled by K4 first-type signaling(s)of the K1 first-type signalings, the K4 is a positive integer notgreater than the K1.
 15. The first node according to claim 11, whereinthe first receiver receives K1 radio signals; the K1 first-typesignalings are respectively used for scheduling the K1 radio signals, K1bit blocks are used for generating the K1 radio signals; a physicallayer channel occupied by any of the K1 radio signals is a PhysicalSidelink Shared Channel.
 16. The first node according to claim 11,wherein each of the M1 first-type signalings is associated to the firsttime-frequency resource set, any of the K1 first-type signalings is oneof the M1 first-type signalings; a given first-type signaling is any ofthe M1 first-type signalings, the given first-type signaling comprises afirst field, the first field is used for determining a sequence numberof the given first-type signaling in the M1 first-type signalings; theM1 is a positive integer not less than the K1.
 17. The first nodeaccording to claim 11, wherein the K1 is equal to
 1. 18. The first nodeaccording to claim 15, wherein a transport channel occupied by any ofthe K1 radio signals is a Sidelink Shared Channel.
 19. The first nodeaccording to claim 12, wherein the first time-frequency resource set andthe second time domain resource set are configured by a higher layersignaling.
 20. The first node according to claim 15, wherein the firsttime-frequency resource set comprises a positive integer number ofresource elements.